• 1. default copy constructor: 缺省复制构造函数
• 2. default copy constructor function: 默认复制构造函数

• 1.Why am I not provided with a default copy constructor from a volatile?
  我为什么不具有挥发性的默认的复制构造函数？
  dict.yoduao.com
• 2.Default copy constructor does a very simple operation, they will do a bit-wise (member-wise) copy of an object, which means that the object will be copied bit by bit.
  如果程序员没有提供拷贝构造函数，那么编译器会自动生成默认的拷贝构造函数。默认的拷贝构造函数会执行简单的操作，即按位拷贝对象。
  dict.yoduao.com
• 3.We all know that the implicit copy constructor operates as follows: default construct all member variables, then assign each member variable the appropriate corresponding value.
  我们都知道，这个隐式的拷贝构造函数操作如下：默认构建所有成员变量，然后分配每个成员变量相应的对应值。
  dict.yoduao.com

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